I also have Tyrant tunes, but i havent had any surging. But i used to own a 99' f250 with the 7.3 and it had a surging issue that ended up just being a faulty TPS (throttle position sensor) and after a cheap 20 dollar fix it didnt surge. Not saying thats the issue youre having but maybe the tunes are a little jacked up and arent reading the data from the sensor in 1st gear properly.

I had a surge on mine when loading the hot tune from PIP. They had to rewrite them three times before getting it right. That was the only tune that did it and it was only surging while parked. Really strange but since rewriting, it's been good. However, no more PIP so hope it doesn't come back for me. Also, I didn't ask what was causing it. It seemed to baffle him as he said he'd never had one do it. Hope you get it figured out. I don't believe it's the truck but is in fact the tune.

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